Loan Payment Calculator

Reading your result

This calculator estimates the monthly principal and interest payment on a fixed-rate installment loan. Enter the amount you’ll borrow, the contractual annual interest rate, and the number of monthly payments. The result shows the scheduled payment, interest paid over the term, and total principal plus interest. Use those figures together: a payment that fits this month can still represent an expensive borrowing decision over several years.

The calculation assumes equal monthly payments, an unchanged interest rate, and no missed payments or additional borrowing. It doesn’t predict whether a lender will approve an application. The example rates on this page illustrate the mathematics; they aren’t advertised offers or a statement about the rate available to you. Obtain a written quote before comparing an estimate with an actual loan.

How to use the calculator

Loan amount: enter the principal on which the lender calculates interest. This isn’t always the cash deposited into your bank account. If an origination fee is deducted before disbursement, your loan balance can exceed the amount you receive. If a fee is added to the balance, include that financed fee in the principal. Keep a separate record of costs paid in cash.

Annual interest rate: enter the loan’s contract rate as a percentage. For example, enter 12 for a 12% rate. Don’t substitute an APR that includes fees and then add those same fees again. The CFPB explains that the interest rate measures interest charged on borrowing, while APR can include additional loan charges. Review both figures when comparing offers, but use the appropriate rate for each calculation. See the CFPB explanation of interest rate and APR.

Term: enter the number of monthly payments remaining or planned. A three-year term contains 36 monthly payments. If you’re estimating an existing loan, use its current principal and remaining term, rather than combining the original balance with the time left. A lender’s exact payoff quote may include accrued interest that isn’t in your statement balance.

How the calculation works

Let P be the principal, r the monthly rate, and n the number of payments. The monthly payment is P × r ÷ [1 − (1 + r)⁻ⁿ]. The monthly rate is the annual contract rate, expressed as a decimal, divided by 12. For a zero-interest loan, the formula simplifies to P ÷ n. This is the standard mathematical model for a loan amortized through equal monthly payments.

Each period begins with the balance still outstanding. Interest for that period equals the balance multiplied by the monthly rate. The rest of the payment reduces principal. The next month starts with the smaller balance, so interest generally decreases while the principal portion increases. The CFPB’s mortgage glossary describes amortization as reducing a loan through regular payments over time.

The calculator retains additional precision internally and rounds displayed money to cents. An actual lender may round interest and payments at different stages or accrue interest daily. Consequently, the final payment can differ by a few cents, and a daily-interest loan may differ by more when payment dates move.

Loan payment calculator example: $10,000 over three years

Suppose a hypothetical borrower receives a fixed-rate loan with a $10,000 principal, a 12% annual contract rate, and 36 monthly payments. There are no fees in this example. The monthly rate is 1%, and the calculated monthly payment is approximately $332.14.

In the first month, interest is $100: $10,000 multiplied by 1%. Approximately $232.14 of the payment reduces principal. The balance then falls to about $9,767.86. This helps explain why paying $332.14 doesn’t reduce the balance by that entire amount. Near the end of the schedule, most of each payment goes toward principal.

The total above uses the unrounded calculated payment and a final balance adjustment. Multiplying the displayed payment by 36 can produce a small rounding difference. For a binding payment amount, use the lender’s disclosures and signed repayment schedule.

Compare a shorter term with a longer term

Keep the $10,000 principal and 12% annual rate unchanged, but extend repayment from 36 to 60 months. The estimated payment falls to $222.44. Total interest rises to $3,346.67. That’s about $109.70 less required each month, but approximately $1,389.52 more interest over the full repayment period.

This comparison makes the tradeoff visible without assuming one term fits every household. A shorter term requires more reliable monthly cash flow. A longer term leaves more room in the monthly budget, but keeps the obligation in place for longer. Compare the payment with a realistic budget and consider whether your expected income can support it throughout the term.

When offers have different rates, terms, or fees, enter each offer separately. Write down the cash received, required monthly payment, total interest, and additional fees. Comparing only payments can conceal an expensive extension of the repayment period.

Account for fees and the cash you actually receive

Imagine the same $10,000 loan includes a 5% origination fee deducted from the proceeds. The fee is $500, so the borrower receives $9,500 while still repaying a $10,000 principal. Under the same interest and term assumptions, the payment remains about $332.14. The economic cost relative to cash received is the $1,957.15 interest plus the $500 fee, or $2,457.15.

If you need exactly $10,000 in usable cash, a $10,000 loan with a deducted fee doesn’t meet that need. Ask the lender to explain the gross loan amount required, how the fee is calculated, and the resulting APR. Don’t describe a fee as free simply because it’s deducted or financed instead of paid separately.

Optional products, late charges, and prepayment charges aren’t included automatically. Add known costs to your comparison and identify which depend on future events. For a useful offer comparison, keep the amount of usable cash and the repayment horizon consistent.

Put the payment into your monthly budget

Start with take-home income and essential expenses, then add existing required debt payments. Include irregular expenses such as annual insurance, vehicle maintenance, and school costs by setting aside a monthly amount. The money remaining after those commitments gives more context than the loan payment alone.

A lender may also assess debt-to-income ratio using gross income. That’s a different view from a household budget based on money available after payroll deductions. Our debt-to-income calculator explains that distinction. A ratio isn’t an approval promise and doesn’t capture all living costs.

Try a second scenario with a smaller loan. Reducing the principal lowers both the payment and the total interest when the rate and term stay unchanged. Consider whether postponing part of a purchase or using some savings changes the amount you need, while preserving cash for necessary expenses.

What changes if you pay extra?

Additional payments applied to principal can shorten repayment and reduce future interest. The ordinary payment result on this page assumes only the scheduled amount. It doesn’t assume that you’ll always have extra cash or that your lender will automatically apply an overpayment in the way you intend.

Before making extra payments, check the loan agreement for prepayment terms and ask how to designate a payment toward principal. For mortgages, the CFPB notes that some loans have prepayment penalties. Contract terms differ across loan products. Keep enough cash available to meet upcoming bills, and compare any fee with the projected interest reduction.

Make the comparison fair across offers

Prepare one row for each written quote and keep the desired cash amount consistent. An offer for $10,000 with a deducted fee is different from an offer that deposits the full $10,000. Likewise, a lower payment over five years shouldn’t be compared with a three-year payment as though the only difference were the interest rate.

Record which costs are certain, which are optional, and which arise only after a late payment or early payoff. Check whether the rate is fixed for the entire term. If a quote is incomplete, mark the missing detail instead of filling the gap with a favorable assumption. The calculator is a way to organize verified inputs, not a substitute for obtaining them.

Loan payment calculator questions

Does the result include every borrowing cost?

No. The core result includes principal and modeled interest. It excludes fees unless they are included in the principal you enter. A fee paid separately or withheld from proceeds still affects the cost of borrowing. Use the fee discussion above and the lender’s APR disclosure alongside the result.

Can I use this for a credit card?

A credit card is revolving credit with its own interest, minimum-payment, and purchase rules. Use the credit card payoff calculator for a fixed-payment illustration. Adding purchases or paying only a changing minimum requires a different schedule from a fixed installment loan.

Why is my lender’s payment different?

Check the principal, rate, number of payments, first due date, financed fees, and any insurance or other items included in the quoted payment. Daily interest, an irregular first period, and rounding can also change the amount. Ask for an itemized explanation rather than treating a calculator estimate as a contract.

What happens at 0% interest?

The scheduled payment is principal divided by the number of monthly payments. A $6,000 balance over 24 months is $250 monthly before fees. A promotional 0% arrangement may have separate eligibility or deferred-interest terms, so confirm the written conditions before applying this simple model.

Can the calculator choose the best loan for me?

It can make payment and interest tradeoffs easier to compare. It can’t evaluate every contract term, predict future income, or determine lender approval. Use the result to ask better questions about total cost, cash received, payment flexibility, and the consequences of paying late.